CVE-2026-56317 Nuxt - Cross-Site Scripting via NoScript Component Slot Content
Attackers can execute arbitrary scripts in the victim's browser via untrusted data in Nuxt NoScript component slots.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-56317?
CVE-2026-56317 is a low-severity cross-site scripting vulnerability in Nuxt, published on 20 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Nuxt before 4.4.7 (and the 3.x branch before 3.21.7) contains a cross-site scripting vulnerability in the NoScript component that writes slot content to innerHTML without escaping. Attackers can inject malicious scripts through untrusted data in NoScript slots, such as route.query parameters, which execute in the document context when the noscript tag is implicitly closed by script tags.
Weakness: CWE-79
Which versions are affected by CVE-2026-56317?
4 open source packages ship an affected version, including nuxt. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nuxt npm | All versions | 3.21.7 |
nuxt npm | All versions | 3.21.7 |
nuxt npm | From 4.0.0 | 4.4.7 |
nuxt npm | From 4.0.0 | 4.4.7 |
Products include Nuxt Nuxt.
How do I fix CVE-2026-56317?
Upgrade nuxt to a fixed version for your release line: 3.21.7 or 4.4.7.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-56317 being exploited?
There is no known exploitation of CVE-2026-56317 in the wild and no public exploit code.
Other vulnerabilities in Nuxt
- CVE-2026-53721 Nuxt: Route-rule middleware bypass via case-sensitivity mismatch between vue-router and the routeRules matcher
- CVE-2024-23657 Path Traversal: '../filedir' in Nuxt Devtools
- CVE-2024-34344 Remote code execution via the browser when running the test locally in nuxt
- CVE-2024-42352 Server-Side Request Forgery (SSRF) in nuxt-icon
- CVE-2023-3224 Code Injection in nuxt/nuxt
Sources
Also known as CLSA-2026-1788337370, CLSA-2026-1788522007, CLSA-2026-1788960197, CLSA-2026-1792161461, CLSA-2026-1792161602, CLSA-2026-1792161824 and 2 more.